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MICROELECTROMETER RASTER INPUT SCANNER

Publishing Venue

Xerox Disclosure Journal

Abstract

A microelectrometer Raster Input Scanner (RIS) offers an opportunity for better image quality by detecting the image prior to the development step, offers a more facile architecture for a laser to provide a triple function, (i.e., RIS, Raster Output Scanning or ROS and copying), and simplifies the asynchronous transceiver op-portunities since the xerographic development subsystem need not be run in an asynchronous mode. Implementation requires focus on the following areas:

Country

Undisclosed

Language

English (United States)

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A microelectrometer Raster Input Scanner (RIS) offers an opportunity for better image quality by detecting the image prior to the development step, offers a more facile architecture for a laser to provide a triple function, (i.e., RIS, Raster Output Scanning or ROS and copying), and simplifies the asynchronous transceiver op- portunities since the xerographic development subsystem need not be run in an asynchronous mode. Implementation requires focus on the following areas:

1. transit times for discharge of small local areas of the photoreceptor;

2. distance requirements, photoreceptor to microelectrometer;

3. microphonics problems;

4. problems of large area capacitive sensing small, localized discharge current as well as defective current flow due to photoreceptor drum rotation, etc.; and

2. The photoreceptor to microelectrometer distance must be very small. However, a readhead may be placed on a flexible substrate which may then run in contact with the drum and exploit the electrostatic force to maintain contact and conform to the surface of the drum. Standard xerographic drum lubricants will enable long life.

Issues 3 and 4 are primarily concerned with the fundamental design of a microelectrometer.

Figure 1 shows the fundamental concept of a segmented microelectrometer 5 for use as an image pickup head, which is easily fabricated on a Mylar or equivalent substrate 6. Microelectrometer 5 is fundamentally a linear array of small capacitors 8 electrically connected through a selector switch 9 to a high impedance differential op amp 10 which then completes the circuit to the photoreceptor drum 12 of a xerographic system. Microelectrometer 5 therefore, can detect discharge current at isolated pixel regions of photoreceptor 12. By segmenting the capacitive pick-up head, a number of advantages are achieved. First, the effects of small capacitor discharge in parallel with the large area capacitor of the photoreceptor is eliminated. Secondly, the effects of photoreceptor drum rotation are localized to those of the specific pixel under investigation. Thus, for very short dwell times, errors are minimized.